684169 has 4 divisors (see below), whose sum is σ = 692496. Its totient is φ = 675844.

The previous prime is 684163. The next prime is 684191. The reversal of 684169 is 961486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684169 - 2¹³ = 675977 is a prime.

It is a super-2 number, since 2×684169² = 936174441122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4039 + ... + 4204.

It is an arithmetic number, because the mean of its divisors is an integer number (173124).

2⁶⁸⁴¹⁶⁹ is an apocalyptic number.

It is an amenable number.

684169 is a deficient number, since it is larger than the sum of its proper divisors (8327).

684169 is an equidigital number, since it uses as much as digits as its factorization.

684169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8326.

The product of its digits is 10368, while the sum is 34.

The square root of 684169 is about 827.1450900537. The cubic root of 684169 is about 88.1159370657.

The spelling of 684169 in words is "six hundred eighty-four thousand, one hundred sixty-nine".